JPH0199447A - Transmission line and distribution line monitoring system - Google Patents
Transmission line and distribution line monitoring systemInfo
- Publication number
- JPH0199447A JPH0199447A JP62256046A JP25604687A JPH0199447A JP H0199447 A JPH0199447 A JP H0199447A JP 62256046 A JP62256046 A JP 62256046A JP 25604687 A JP25604687 A JP 25604687A JP H0199447 A JPH0199447 A JP H0199447A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- power transmission
- optical fiber
- test results
- master station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 32
- 238000012544 monitoring process Methods 0.000 title claims description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 5
- 230000005856 abnormality Effects 0.000 claims description 4
- 239000002243 precursor Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000003745 diagnosis Methods 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 238000007689 inspection Methods 0.000 abstract description 7
- 238000004891 communication Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 230000000644 propagated effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Emergency Protection Circuit Devices (AREA)
- Selective Calling Equipment (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は変電所等における送配電線路の状態を監視する
ためのシステムに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a system for monitoring the status of power transmission and distribution lines in substations and the like.
変電所には所内の電力機器または施設を連繋して多数の
送配電線路が布設されており、各送配電線路の保守管理
は変電所内の重要な課題であって、地絡、破断、熱破壊
等の事故が起こる際の徴候を察知して事故を未然に防い
だり、万一事故が発生した場合には早期発見を行ったり
することが大切である。A large number of power transmission and distribution lines are installed at a substation, connecting the power equipment or facilities within the station, and maintenance and management of each power transmission and distribution line is an important issue within the substation, and it is important to prevent ground faults, breaks, and thermal damage. It is important to prevent accidents by detecting the signs when such accidents occur, and to detect them early if they occur.
ところが多数の送配電線路について、各別にその状態を
検査して全体を監視するためには長時間を必要とするの
で、これを完璧には実施できないのが現状であり、多数
の送配電線路の状態を同時に監視できるシステムの開発
が望まれていた。However, since it takes a long time to inspect the condition of a large number of power transmission and distribution lines individually and monitor the whole, it is currently impossible to do this perfectly. There was a desire to develop a system that could simultaneously monitor the status.
本発明はかかる事情に鑑みてなされたものであり、送配
電線路の正常、異常を評価する各種センサに接続された
複数の子局と親局とを通信用の２本の光ファイバにて連
結し、各子局に集められる検査結果を光信号にて親局に
伝送し、コンビュー夕にて検査結果を処理する構成とす
ることにより、多数の送配電線路について同時にその状
態を監視できる送配電線路監視システムを提供すること
を目的とする。The present invention was made in view of the above circumstances, and connects a plurality of slave stations connected to various sensors for evaluating the normality or abnormality of power transmission and distribution lines and a master station using two optical fibers for communication. The test results collected at each slave station are transmitted to the master station using optical signals, and the test results are processed at the control station. This enables power transmission and distribution systems to simultaneously monitor the status of multiple power transmission and distribution lines. The purpose is to provide a track monitoring system.
本発明に係る送配電線路監視システムは、電力機器また
は施設を連繋する送配電線路の状態を監視するシステム
において、活線絶縁診断センサ。A power transmission and distribution line monitoring system according to the present invention includes a live line insulation diagnostic sensor in a system that monitors the status of a power transmission and distribution line that connects power equipment or facilities.
事故区間測定センサ、多点温度測定センサ、事故点標定
センサ及び地絡前駆放電検出センサを含み、検出した信
号を演算処理して送配電線路の正常。It includes a fault section measurement sensor, multi-point temperature measurement sensor, fault point location sensor, and ground fault precursor discharge detection sensor, and calculates and processes the detected signals to check the normality of the power transmission and distribution line.
異常を評価する複数のセンサと、該複数のセンサのうち
の少なくとも１個のセンサに接続され、センサからの検
査結果を集める複数の子局と、各子局から検査結果を集
信する親局と、親局に集信された検査結果を処理するコ
ンピュータと、子局及び親局間を連繋する２本の光ファ
イバとを具備することを特徴とする。A plurality of sensors that evaluate abnormalities, a plurality of slave stations that are connected to at least one of the plurality of sensors and collect test results from the sensors, and a master station that collects test results from each slave station. It is characterized by comprising: a computer that processes test results collected at the master station; and two optical fibers that connect the slave station and the master station.
本発明に係る送配電線路監視システムにあっては、子局
に接続した各センサは検出した信号を演算処理して送配
電線路の正常、異常を評価し、その評価した検査結果を
得る。子局は各センサにて得られた検査結果を集める。In the power transmission and distribution line monitoring system according to the present invention, each sensor connected to the slave station processes the detected signals to evaluate whether the power transmission and distribution line is normal or abnormal, and obtains the evaluated test results. The slave station collects the test results obtained from each sensor.
光ファイバは子局に集められた検査結果を親局へ伝送し
、コンピュータはこの検査結果をパターン処理する。The optical fiber transmits the test results collected at the slave station to the master station, and the computer processes the test results into patterns.
以下本発明をその実施例を示す図面に基づき説明する。 The present invention will be explained below based on drawings showing embodiments thereof.
第１図は本発明に係る送配電線路監視システムの構成を
示す模式図であり、図において２゜２．２は本発明の監
視システムにおける子局を示す。各子局２には夫々複数
のセンサが接続されており、複数のセンサは何れも送配
電線路の状態を検出して送配電線路の正常、異常を評価
するセンサであって、活線の絶縁状態を診断する活線絶
縁診断センサ３．事故の区間を測定する事故区間測定セ
ンサ４．複数個所の温度を測定する多点温度測定センサ
５．事故の地点を標定する事故点標定センサ６及び地絡
事故の前徴候である放電現象を検出する地絡前駆放電検
出センサ７から構成される。各子局２には、これらの５
種のうちの２または３種のセンサが接続されている。FIG. 1 is a schematic diagram showing the configuration of a power transmission and distribution line monitoring system according to the present invention, and in the figure, 2.2.2 indicates a slave station in the monitoring system of the present invention. A plurality of sensors are connected to each slave station 2, and each of the plurality of sensors is a sensor that detects the state of the power transmission and distribution line and evaluates whether the power transmission and distribution line is normal or abnormal. Live insulation diagnostic sensor for diagnosing the condition 3. Accident area measurement sensor for measuring the accident area 4. Multi-point temperature measurement sensor that measures temperature at multiple locations5. It is composed of an accident point location sensor 6 that locates the accident point, and a ground fault precursor discharge detection sensor 7 that detects a discharge phenomenon that is a precursor to a ground fault accident. Each slave station 2 has these 5
Sensors of two or three of the species are connected.
センサ３ （４，５，６，７）は、送配電線路に設置さ
れるセンサ本体３ａ （４ａ、 ５ａ、 ６ａ、 ？ａ
） 、センサ本体３ａ （４ａ、 ５ａ、 ６ａ、 ７
ａ）からの出力を演算処理して送配電線路の正常、異常
を評価するセンサ装置３ｂ （４ｂ、 ５ｂ、 ６ｂ、
７ｂ） 、及びセンサ本体３ａ（４ａ、 ５ａ、 ６
ａ、 ７ａ）とセンサ装置３ｂ （４ｂ、 ５ｂ、 ６
ｂ。Sensors 3 (4, 5, 6, 7) are sensor bodies 3a (4a, 5a, 6a, ?a) installed on power transmission and distribution lines.
), sensor body 3a (4a, 5a, 6a, 7
Sensor device 3b (4b, 5b, 6b,
7b), and sensor body 3a (4a, 5a, 6
a, 7a) and sensor device 3b (4b, 5b, 6
b.
７ｂ）とを接続する光ファイバあるいはメタルケーブル
３ｃ （４ｃ、 ５ｃ、 ６ｃ、 ７ｃ）からなる。セ
ンサ本体３ａ （４ａ、 ５ａ、 ６ａ、 ７ａ）にて
得られる信号が光ファイバあるいはメタルケーブル３ｃ
（４ｃ、 ５ｃ、 ６ｃ、 ７ｃ）を伝播されてセン
サ装置３ｂ （４ｂ、 ５ｂ、 ６ｂ、 ７ｂ）へ人力
され、センサ装置３ｂ （４ｂ、 ５ｂ、 ６ｂ、 ７
ｂ）にて伝播された信号が演算処理され、予め入力され
ている基準値と比較されて送配電線路の正常、異常が評
価され、この評価された検査結果が子局２へ出力される
。7b) and optical fiber or metal cables 3c (4c, 5c, 6c, 7c). The signal obtained from the sensor body 3a (4a, 5a, 6a, 7a) is connected to an optical fiber or metal cable 3c.
(4c, 5c, 6c, 7c) and are manually input to the sensor device 3b (4b, 5b, 6b, 7b),
The signal propagated in b) is subjected to arithmetic processing and compared with a reference value input in advance to evaluate whether the power transmission/distribution line is normal or abnormal, and the evaluated test results are output to the slave station 2.
また図中１は、本発明の監視システムの親局を示してお
り、親局１には集信される検査結果を処理するパソコン
８が接続されている。Further, reference numeral 1 in the figure indicates a master station of the monitoring system of the present invention, and a personal computer 8 is connected to the master station 1 for processing the collected test results.
親局１及び３個の子局２，２．２は、ポリマクラッド石
英コアファイバからなる通信用の２本の光ファイバ（主
回線光ファイバ１０．副回線光ファイバ１１）にて連結
されている。The master station 1 and the three slave stations 2, 2.2 are connected by two communication optical fibers (main line optical fiber 10, sub line optical fiber 11) made of polymer clad quartz core fibers. .
各子局２は、検査結果を一時的に記憶する記憶部（図示
せず）を具備しており、得られた検査結果を一旦記憶部
に記憶し、主回線光ファイバ１０を伝播する情報伝送許
可信号に基づきこの検査結果を光信号として主回線光フ
ァイバｌＯへ出力し、親局１へ集信させる。親局１は各
子局２から集信された検査結果をパソコン８へ出力する
。パソコン８は入力される検査結果を処理して画面に送
配電線路の保守状態を表示する。Each slave station 2 is equipped with a storage unit (not shown) that temporarily stores test results, and the obtained test results are temporarily stored in the storage unit, and the information is transmitted through the main line optical fiber 10. Based on the permission signal, this inspection result is output as an optical signal to the main line optical fiber 10, and is concentrated to the master station 1. The master station 1 outputs the test results collected from each slave station 2 to the personal computer 8. The personal computer 8 processes the input test results and displays the maintenance status of the power transmission and distribution lines on the screen.
本発明の監視システムにおいて通常は、主回線光ファイ
バ１０を介して光信号が伝播されるが、もし、隣合う局
間の回線光ファイバが切断された場合には、副回線光フ
ァイバ１１も利用して光信号が伝播される（ループバッ
ク方式）ように本発明の監視システムは構成されている
。In the monitoring system of the present invention, optical signals are normally propagated via the main line optical fiber 10, but if the line optical fiber between adjacent stations is cut, the auxiliary line optical fiber 11 is also used. The monitoring system of the present invention is configured so that the optical signal is propagated (loopback method).
次に動作について説明する。Next, the operation will be explained.
センサ本体３ａ （４ａ、 ５ａ、 ６ａ、 ７ａ）は
送配電線路の状態に応じた信号を光ファイバあるいはメ
タルケーブル３ｃ （４ｃ、 ５ｃ、 ６ｃ、 ７ｃ）
へ出力する。センサ装置３ｂ （４ｂ、 ５ｂ、 ６ｂ
、 ７ｂ）は光ファイバあるいはメタルケーブル３ｃ
（４ｃ、 ５ｃ、 ６ｃ、 ７ｃ）を伝播した信号を受
信し、信号量及び信号の種類を演算処理し、演算結果を
基準値と比較して送配電線路の正常、異常を評価する。The sensor body 3a (4a, 5a, 6a, 7a) transmits signals according to the state of the power transmission and distribution lines through optical fiber or metal cable 3c (4c, 5c, 6c, 7c).
Output to. Sensor device 3b (4b, 5b, 6b
, 7b) is an optical fiber or metal cable 3c
(4c, 5c, 6c, 7c) are received, the signal amount and signal type are processed, and the calculation results are compared with a reference value to evaluate whether the power transmission and distribution line is normal or abnormal.
センサ装置３ｂ （４ｂ、 ５ｂ。Sensor device 3b (4b, 5b.
６ｂ、 ７ｂ）は評価された検査結果を子局２へ出力し
、子局２はこの検査結果を記憶部に記憶する。6b, 7b) output the evaluated test results to the slave station 2, and the slave station 2 stores the test results in its storage section.
子局２は、主回線光ファイバ１０を介して伝播される情
報伝送許可信号を入力すると、記憶部に記憶した検査結
果を主回線光ファイバ１０へ出力する。When the slave station 2 receives the information transmission permission signal propagated through the main line optical fiber 10, it outputs the test results stored in the storage section to the main line optical fiber 10.
検査結果を示す光信号は先主回線ファイバ１０を伝播さ
れて親局１へ集信される。パソコン８はこの集信された
検査結果を処理して画面にその処理内容を表示する。An optical signal indicating the test result is propagated through the main line fiber 10 and concentrated to the master station 1. The personal computer 8 processes the collected test results and displays the processing contents on the screen.
本実施例においては、検査結果はセンサにおいて前処理
されているので、各子局から親局に伝送される情報は単
純なもの（送配電線路の稼働状態が正常か異常か）であ
り、パソコン８は小容量のコンピュータでよい。In this example, the inspection results are preprocessed in the sensor, so the information transmitted from each slave station to the master station is simple (whether the operating status of the power transmission and distribution line is normal or abnormal), and the information is sent to the computer. 8 may be a small-capacity computer.
通常は上述したように主回線光ファイバ１ｏを介して光
信号が伝播される。もし局間において光ファイバが切断
された場合には、正常の部分の主回線光ファイバ１０及
び側回線光ファイバ１１を用いて光信号が伝播される。Normally, an optical signal is propagated through the main line optical fiber 1o as described above. If the optical fiber is cut between stations, the optical signal is propagated using the normal main line optical fiber 10 and side line optical fiber 11.
以下この場合について説明する。This case will be explained below.
第２図はこのような場合の状態を示す模式図であり、２
個の子局２，２間における主回線光ファイバ１０及び側
回線光ファイバ１１が切断されている。FIG. 2 is a schematic diagram showing the state in such a case.
The main line optical fiber 10 and the side line optical fiber 11 between the slave stations 2 and 2 have been cut.
このような場合には回線光ファイバｉｏ、 ｉｔにて連
結されていない２個の子局２，２の内部において主回線
光ファイバｌＯ及び側回線光ファイバ１１が相互に自動
的に接続されて、新しいループが形成される。そしてこ
の新しく形成されたループを介して光信号が伝播される
。この結果、回線光ファイバが切断された場合にあって
も子局２，２がら親局１へ検査結果を集信することがで
きる。In such a case, the main line optical fiber IO and the side line optical fiber 11 are automatically connected to each other within the two slave stations 2, 2 which are not connected by the line optical fibers IO and IT. A new loop is formed. The optical signal is then propagated through this newly formed loop. As a result, even if the line optical fiber is cut, test results can be collected from the slave stations 2, 2 to the master station 1.
なお、本実施例では主回線光ファイバ１０及び側回線光
ファイバ１１がポリマクランド石英コアファイバからな
る構成としたが、これに限らず、他の非石英系光ファイ
バ（多成分ガラスファイバ、プラスチソクファイハ等）
または石英系光ファイバであってもよい。非石英系光フ
ァイバは取扱いが容易であるという利点を有し、石英系
光ファイバは多量の光信号を伝播でき、また長距離にわ
たって光信号を伝播できるという利点を有する。In this embodiment, the main line optical fiber 10 and the side line optical fiber 11 are made of polymer crand quartz core fibers, but the present invention is not limited to this, and other non-silica type optical fibers (multi-component glass fiber, plastic Faiha et al.)
Alternatively, it may be a silica-based optical fiber. Non-silica optical fibers have the advantage of being easy to handle, and silica optical fibers have the advantage of being able to propagate large quantities of optical signals and propagate optical signals over long distances.
また本実施例では、センサとして前述したような５種の
センサのみを用いることとしたが、これらに加えてケー
ブル移動検知センサ、防災・対環境汚染検知センサ等の
他のセンサを子局に接続させる構成としてもよいことは
勿論である。In addition, in this embodiment, only the five types of sensors described above are used, but in addition to these, other sensors such as a cable movement detection sensor, a disaster prevention/environmental pollution detection sensor, etc. are connected to the slave station. Of course, it is also possible to adopt a configuration in which the
以上詳述した如く本発明の監視システムでは、送配電線
路の正常、異常を評価するセンサに接続される複数の子
局と、集信される検査結果を処理するコンピュータに接
続される親局とを通信用の光ファイバにて連結した構成
をなし、各センサにて得られた検査結果を子局から親局
に集信させ、コンピュータにて処理するので、同時に多
数の送配電線路について正確な監視を行うことができる
。As detailed above, the monitoring system of the present invention includes a plurality of slave stations connected to sensors that evaluate the normality or abnormality of power transmission and distribution lines, and a master station connected to a computer that processes the collected test results. They are connected using optical fibers for communication, and the test results obtained from each sensor are collected from the slave station to the master station and processed by a computer, so it is possible to accurately test a large number of power transmission and distribution lines at the same time. Monitoring can be carried out.
第１図は本発明に係る送配電線路監視システムの構成を
示す模式図、第２図は回線光ファイバが部分的に切断さ
れた状態を示す模式図である。
■・・・親局 ２・・・子局 ３，４，５，６．７・・
・センサ ８・・・パソコン １０・・・主回線光ファ
イバ１１・・・側回線光ファイバFIG. 1 is a schematic diagram showing the configuration of a power transmission and distribution line monitoring system according to the present invention, and FIG. 2 is a schematic diagram showing a state where the line optical fiber is partially cut. ■...Master station 2...Slave station 3, 4, 5, 6.7...
・Sensor 8...PC 10...Main line optical fiber 11...Side line optical fiber
Claims (1)
監視するシステムにおいて、 活線絶縁診断センサ、事故区間測定センサ、多点温度測
定センサ、事故点標定センサ及び地絡前駆放電検出セン
サを含み、検出した信号を演算処理して送配電線路の正
常、異常を評価する複数のセンサと、該複数のセンサの
うちの少なくとも１個のセンサに接続され、センサから
の検査結果を集める複数の子局と、各子局から検査結果
を集信する親局と、親局に集信された検査結果を処理す
るコンピュータと、子局及び親局間を連繋する２本の光
ファイバとを具備することを特徴とする送配電線路監視
システム。[Claims] 1. A system for monitoring the status of power transmission and distribution lines connecting power equipment or facilities, comprising: a live line insulation diagnosis sensor, a fault section measurement sensor, a multipoint temperature measurement sensor, a fault point location sensor, and a ground fault. A plurality of sensors including a precursor discharge detection sensor, which evaluate the normality or abnormality of the power transmission and distribution line by processing the detected signals; and a sensor connected to at least one of the plurality of sensors and inspected from the sensor. A plurality of slave stations that collect results, a master station that collects test results from each slave station, a computer that processes the test results collected at the master station, and two wires that connect the slave stations and the master station. A power transmission and distribution line monitoring system characterized by comprising an optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62256046A JPH0199447A (en) | 1987-10-09 | 1987-10-09 | Transmission line and distribution line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62256046A JPH0199447A (en) | 1987-10-09 | 1987-10-09 | Transmission line and distribution line monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0199447A true JPH0199447A (en) | 1989-04-18 |
Family
ID=17287153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62256046A Pending JPH0199447A (en) | 1987-10-09 | 1987-10-09 | Transmission line and distribution line monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0199447A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04216104A (en) * | 1990-12-14 | 1992-08-06 | Omron Corp | Remote i/o system for programmable controller |
| US5225867A (en) * | 1990-07-03 | 1993-07-06 | Brother Kogyo Kabushiki Kaisha | Chromatic image recording apparatus |
| CN110940381A (en) * | 2019-12-10 | 2020-03-31 | 国网上海市电力公司 | Cable pit environmental condition remote monitoring system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5834647A (en) * | 1981-08-25 | 1983-03-01 | Fujitsu Ltd | Telemeter doubling system |
| JPS58172931A (en) * | 1982-03-31 | 1983-10-11 | 東京電力株式会社 | Power distribution system monitoring system |
| JPS60190132A (en) * | 1984-03-08 | 1985-09-27 | オーテツク電子株式会社 | Substation facility automatically monitoring system |
| JPS61142918A (en) * | 1984-12-12 | 1986-06-30 | 株式会社日立製作所 | Protective relay system |
-
1987
- 1987-10-09 JP JP62256046A patent/JPH0199447A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5834647A (en) * | 1981-08-25 | 1983-03-01 | Fujitsu Ltd | Telemeter doubling system |
| JPS58172931A (en) * | 1982-03-31 | 1983-10-11 | 東京電力株式会社 | Power distribution system monitoring system |
| JPS60190132A (en) * | 1984-03-08 | 1985-09-27 | オーテツク電子株式会社 | Substation facility automatically monitoring system |
| JPS61142918A (en) * | 1984-12-12 | 1986-06-30 | 株式会社日立製作所 | Protective relay system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5225867A (en) * | 1990-07-03 | 1993-07-06 | Brother Kogyo Kabushiki Kaisha | Chromatic image recording apparatus |
| JPH04216104A (en) * | 1990-12-14 | 1992-08-06 | Omron Corp | Remote i/o system for programmable controller |
| CN110940381A (en) * | 2019-12-10 | 2020-03-31 | 国网上海市电力公司 | Cable pit environmental condition remote monitoring system |
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